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Adjusting a return already filed

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A taxpayer who realises after filing that their return was wrong does not file a second return — they request a change to the one already assessed. The request can go back further than most people expect, and it is the right route for genuine errors and omissions: a slip that arrived late, a credit not claimed, a deduction overlooked. It is not the route for disagreeing with something CRA decided. That is an objection, a different process with a much shorter deadline, and choosing the wrong one is the most consequential mistake in this area. This tutorial covers how to request a change, how far back it reaches, and where the boundary with objections falls.

How to work through this tutorial

The first step is the one that matters most: 1. Establish whether the taxpayer is correcting their own return or disputing CRA's decision. These take different routes. 2. Understand what an adjustment request is and how it is made. 3. Learn how far back a request can reach. 4. Understand what happens after a request — and that it can go the other way. 5. Know when a change to one year affects others. 6. Know when the situation calls for the Voluntary Disclosures Program instead. 7. Check your work against the common errors. 8. Verify every specific against CRA's published guidance before relying on it. Never file a second return for a year already assessed. That is not how a correction is made and it causes real confusion on the account.

Adjustment or objection?

This distinction governs everything else, and taxpayers cannot be expected to make it themselves. An **adjustment request** is the taxpayer saying: my return was wrong, please change it. There is no dispute. CRA assessed what was filed and what was filed was incomplete or mistaken. An **objection** is the taxpayer saying: CRA's assessment is wrong, and I disagree with it. It is a formal dispute, it preserves appeal rights, and it has a deadline measured from the notice. The practical test is: is the taxpayer telling CRA something new, or telling CRA it got something wrong? A late slip, a forgotten donation receipt, an unclaimed medical expense — those are adjustments. A denied claim the taxpayer maintains was valid, or an income inclusion they dispute — that is an objection. The stakes of choosing wrongly are asymmetric. An adjustment request filed when an objection was needed can let the objection deadline expire while the request is being processed, and the deadline does not pause for it. That can cost the taxpayer their right to dispute entirely. The reverse error — objecting when a simple adjustment would do — wastes time but is recoverable. So when a taxpayer is near their objection deadline and there is any doubt, protecting the deadline is the safer counsel. An objection can be filed and later resolved as a straightforward correction; an expired deadline cannot be recovered except by an application that may be refused.

Making a request

A change can be requested through CRA's online services, which is the fastest route, or on a prescribed paper form, or by letter with the necessary detail. Whatever the route, the request needs the tax year, what should change, and why — with supporting documents. A request that simply asserts a different figure without the slip, receipt or explanation behind it will come back for more information, which adds weeks. A request should be made only after the return has been assessed. Sending a correction while the return is still being processed produces confusion, because the original may be assessed after the correction arrives. Wait for the notice of assessment. Only one request per year should be outstanding at a time. Multiple overlapping requests for the same year are a common cause of delay. Processing takes longer than assessment does, and longer for paper than online. Setting an honest expectation at the outset prevents the follow-up call, and CRA publishes service standards for exactly this. A representative may make a request where their authorisation permits changes rather than only disclosure — the Foundations topic on authorisation covers the distinction, which is precisely where a lower-level authorisation stops being enough.

How far back it reaches

A request to change a return can reach back further than CRA's own normal reassessment period, and this asymmetry surprises people who have heard that years "close" after three. Under the taxpayer relief provisions, CRA may accept a request for a refund or a reduction in tax for a year going back a defined number of years from the end of the year in which the request is made. Confirm the number; it is longer than the normal reassessment period and is the figure that actually answers "how far back can I go". Two things about it are worth stating precisely. It is **discretionary** — CRA may accept the request, not must. And it applies to a refund or reduction; it is not a mechanism for a taxpayer to reopen a year in their favour without limit. Beyond that window, a year is genuinely out of reach for an adjustment. A taxpayer who discovers an old unclaimed credit from many years ago may simply have lost it, which is a difficult conversation but an honest one. The direction matters, as always. CRA's ability to reassess **against** the taxpayer is bounded by the normal reassessment period, with the misrepresentation and waiver exceptions. The taxpayer's ability to request a change in their own favour runs on the relief timeline. Saying "that year is closed" without specifying which direction is meant is a common source of wrong answers.

What happens next

CRA reviews the request and either adjusts the return, partly adjusts it, or declines. Where it adjusts, a notice of reassessment is issued showing the revised figures. A point taxpayers rarely anticipate: a request can result in **more** tax, not less. Asking CRA to look at a year invites it to look properly, and where the review surfaces something the taxpayer had wrong in the other direction, the reassessment reflects that too. This is worth mentioning to anyone requesting a change on a year where their own position is not clean. Where a request is declined, or adjusted differently from what was asked, the taxpayer can object to the resulting reassessment — and that objection has its own deadline running from the new notice. So the adjustment route does not permanently forfeit the dispute route; it simply relocates it. A change to one year commonly affects others. Carryforward amounts, capital losses, tuition, RRSP room and benefit entitlement all flow between years, so a single adjustment can cascade. CRA will generally make the consequential adjustments, but a taxpayer should be told to expect further notices rather than assuming something has gone wrong. Benefit entitlement in particular is recalculated from net income, so an adjustment that changes net income will change benefits — potentially creating an overpayment to be recovered. The benefits line covers that.

When it is a disclosure, not an adjustment

Where the correction involves unreported income rather than an unclaimed deduction — particularly over several years, or where penalties would apply — the Voluntary Disclosures Program may be the appropriate route rather than an ordinary adjustment request. The program exists for taxpayers coming forward about information they have not previously reported, on defined conditions. Where it applies and is accepted, it can provide relief from penalties and partial relief from interest, and protection from prosecution. Three things to be precise about. It has **conditions**, including that the disclosure be voluntary — meaning CRA has not already begun compliance action on the matter — and be complete. It is **not an amnesty**: the tax itself remains payable. And acceptance is not automatic. The practical significance for an agent: a taxpayer volunteering that they have several years of unreported income is not simply making an adjustment request, and routing them to the ordinary process may cost them the relief the program would have provided. The voluntariness condition means the window can close if CRA contacts them first. This is an area to route rather than advise on, but recognising it matters. The signal is unreported income across multiple years, not an overlooked receipt.

Common errors

Routing a dispute into an adjustment request. The objection deadline continues to run and can expire while the request is processed. Routing a simple correction into an objection. Wasteful, but recoverable — unlike the reverse. Filing a second return for a year already assessed. A change is requested, not refiled. Sending a correction before the original return has been assessed. Submitting a request without the supporting documents, then waiting weeks for it to come back. Having several requests outstanding for the same year. Saying a year is "closed" without specifying direction. CRA's reassessment period and the taxpayer's adjustment window are different lengths. Describing the adjustment window as a right. It is discretionary under the relief provisions. Not warning a taxpayer that a request can result in more tax. Not warning that an adjustment can cascade into other years, and into benefit entitlement — potentially creating an overpayment. Letting a representative with disclosure-only authorisation submit a change request. Treating multiple years of unreported income as an ordinary adjustment, when the Voluntary Disclosures Program may apply and its voluntariness condition may lapse if CRA acts first.

What to verify this tutorial against

This was drafted without a source document. The reach-back period and the boundary with objections are the two things to confirm before advising anyone. CRA's pages on requesting a change to your tax return cover the online route, the prescribed form, what to include and the processing expectations. CRA's taxpayer relief guidance sets out the period within which a request for a refund or reduction may be accepted, and confirms that acceptance is discretionary. CRA's objections guidance sets out the objection deadline and what an objection preserves — the objections topic in this line covers it in full. The Income Tax Act sets out the normal reassessment period and the relief provisions, which run on different timelines and in different directions. The Voluntary Disclosures Program has its own information circular setting out the conditions, including voluntariness and completeness, and the relief available. CRA's published service standards give realistic processing times for adjustment requests, which is what to quote rather than an estimate.

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